I've been reloading 30-40 Krag and 30-06 for more than 25 years now... I think I have a pretty good handle on the ins and outs. Yesterday, I reloaded my first 20 rounds of 7.7 ammo and I'm a little stumped: I had to lube the hell out of the cases (waaayyyyy more than I ever have with another caliber), and then it took quite a bit of effort to resize them. It seems that the case necks were expanded quite a lot and had to be sized back down. I confirmed this by measuring the case neck before and after sizing. I have never experienced this with 30-40 or 30-06, or for any pistol ammo for that matter... Is this normal in 7.7x58? If the case necks have expanded that much, then the round must be extremely loose in the chamber. I succeeded in loading the 20 rounds with 39 grains of IMR 4064 and Hornady 174 grain FMJ bullets. I'm heading to the range Saturday.... We'll see how well I did, but I am very curious about the case size issue... I welcome any advice.
Thanks in advance